429 results about "Fork tuning" patented technology

An annular-shaped metal gasket, which can reduce a tightening force necessary to a seal and easily manage the manufacturability and the characteristics thereof, the metal gasket, in an annular-shaped metal gasket having a cross section provided with an outer circumferential opening and formed in one of a laterally U-shape, voids are formed to the innermost circumferential portions on the two confronting flat sealing surfaces of the metal gasket that are in contact with opponent surfaces, each void having a width equal to or more than 40% of the central wall thickness t₀ of a bight section and a height equal to or more than 5% of the height H of the gasket, wherein the cross section of the gasket is formed in a tuning-fork shape. A tightening force necessary to the seal can be reduced by forming the cross section of the metal gasket in the tuning-fork shape and providing the voids with the surfaces of the metal gasket in contact with the opponent surfaces.

The gyroscope comprises: fixed teeth, movable teeth, two mass blocks, two outer frames, two pairs of leavers and two tuning fork resonators. The first mass block and second mass block are respectively connected to the first outer frame and second outer frame through four infolding beams; two outer frames are respectively secured on the anchor point through the outer supporting beam; two outer frames are connected through a pair of folding beams; both right and left sides of the first outer frame are connected to the free end of two tuning fork resonators via the opposite direction force amplifying leaver; the both right and left sides of the outer frame are connected to the free end of two tuning fork resonators via the same direction force amplifying leaver; by testing the resonance frequency of tuning fork resonator at both ends, calculating the rotating speed inputted from outside.

An exemplary piezoelectric vibrating device includes a piezoelectric frame that supports and surrounds a tuning-fork type piezoelectric vibrating piece having a pair of vibrating arms. The device also includes a lid and a package base that are siloxane-bonded to the frame. The lid defines at least one frequency-adjustment hole extending through the thickness dimension of the lid from an inner major surface thereof (facing the frame) to an outer major surface of the lid. The package base defines at least one through-hole electrode passing via a respective electrode through-hole through the thickness of the base from an inner major surface thereof (facing the frame) to the outer major surface thereof. The electrode is connected to the piezoelectric vibrating piece. The lid and base include external electrodes, made of an electrically conductive material, that cover the through-holes and frequency-adjustment hole(s).

The invention provides a resonant pressure sensor and a manufacturing method thereof. A resonator uses a resonator structure based on an SOI silicon-based silicon comb double-ended fixed tuning fork structure. A Wheatstone bridge is formed inside the resonator by two piezoresistive materials (silicon after process doping) and two equivalent resistors (undoped silicon). The resistance change of thepiezoresistive materials is changed by a pressure change to detect the change in resonant frequency. Based on the silicon island structure, the pressure sensor structure is designed to transform thedeformation on a pressure-sensitive film into the plane vibration in the direction of the resonator through the silicon island structure, which not only reduces the mechanical coupling of the sensor,but also improves a quality factor and achieves a wide measurement range and high reliability.

An assembly comprising an expandable corpectomy cage and an insertion instrument, wherein the expandable cage comprises an instrument attachment features, including mating holes on the sides of the outer sleeve, and a ball-shaped pocket on the endplate of the inner sleeve, and the insertion instrument features a tuning-fork shaped holder, which attaches to the mating holes on the implant's outer sleeve using small bosses which mate with the holes under the spring tension of the fork, and a lever with a spherical end that mates with the ball-shaped pocket in the inner sleeve endplate.

The piezoelectric thin-film tuning fork resonator (40) comprises an integral tuning fork made out of a quartz crystal. The tuning fork comprises a base (48) and a pair of parallel vibrating arms (44, 46) extending from the base. Each of the vibrating arms carries:

• • first and second electrodes (62, 64) provided on at least one main surface of the arm, said first and second electrodes being formed respectively on an inner portion and on an outer portion of said one main surface, in such a way as to be spaced apart,
  • first and second piezoelectric thin films (66, 68) formed over the first and second electrodes respectively,
  • third and fourth electrodes (70, 72) formed over the first and second piezoelectric thin films respectively.

The tuning fork resonator (1) includes a base (4) from which first and second parallel vibrating arms (2, 3) extend, carrying a set of excitation electrodes (5, 6) for vibrating the arms at a fundamental frequency. Grooves (7, 8) are formed on at least one of the top or bottom surfaces of each of said arms. The vibrating arms have a generally tapered shape, and are extended by an enlarged flipper shaped portion (9, 10) which forms the free end of each arm. The groove (7, 8) is extended in the direction of the free end of an arm to beyond the start of the flipper (9, 10) so as to increase said first motional capacitance of the resonator for the fundamental frequency, to decrease said second motional capacitance of the resonator for the partial frequency and to ensure better distribution of mechanical stress along the vibrating arms and to increase shock resistance.

A timepiece oscillator including a resonator formed by a tuning fork which includes at least two mobile oscillating parts, fixed to a connection element by flexible elements whose geometry determines a virtual pivot axis having a determined position with respect to this connection element and around which the respective mobile part oscillates, and the centre of masse of the mobile part coincides in the rest position with the respective virtual pivot axis, and, for at least one of the two mobile parts the flexible elements are formed of intersecting resilient strips extending at a distance from each other in two parallel planes, and whose directions, in projection on one of the parallel planes, intersect at the virtual pivot axis of the mobile part.

The invention discloses a gas sensor based on photoacoustic spectrometry, comprising a circuit matched and connected with a light source (1) and a quartz tuning fork (13). The gas sensor is characterized in that an acoustic resonator (6) is composed of a main tube (11) with a branch tube (12) which are communicated with each other vertically; the tube axis of the main tube (11) is coaxial with a light path (2), the tube length of the main tube (11) is 4.57-7.87 mm, and the tube inner diameter of the main tube (11) is 0.4-1.5mm; the tube length of the branch tube (12) is 1-2mm and the tube inner diameter of the branch tube (12) is 0.4-0.5mm; the focus of a focusing lens (4) is located at the communicated part of the main tube (11) and the branch tube (12); the plane and the slit centre of a tuning fork arm (131) of the quartz tuning fork (13) are vertical to and located in the axis of the branch tube (12) respectively, and the distance between the plane of the tuning fork arm (131) and the tail port of the branch tube (12) is 20-50mu m; and the slit width of the tuning fork arm (131) of the quartz tuning fork (13) is 0.28-0.32mm, and the resonant frequency of the tuning fork arm (131) of the quartz tuning fork (13) is 31.768-33.768kHz. The gas sensor based on photoacoustic spectrometry realizes coupling between a light-excited acoustic energy and the quartz tuning fork with the highest efficiency and can be used for the field of trace gas detection.

A measurement head particularly for borehole use can measure multiple parameters with no electronics in the head and only a single conductor cable. Double-ended tuning forks (26, 28 and 38, 40) in the head are arranged to respond to different parameters such as temperature and pressure by adjusting their resonant frequencies. A drive signal on the conductor (50) is applied to transducers (30, 32, 42, 44) on all the tuning forks and those whose instantaneous resonant frequency is close will resonate. The signal is removed and the transducers return a decaying signal at the resonant frequency along the conductor. Other drive frequencies are tried, to locate the other sensors whose frequency ranges are separate.

A vibration gyro sensor is provided which is capable of generating time information and detecting an angular velocity. A driving signal for driving a tuning fork piezoelectric vibrating reed is generated based on an excitation signal generated by an oscillation circuit. An angular velocity signal is obtained based on a detection signal generated by a detection electrode of the tuning fork piezoelectric vibration reed. The excitation signal generated by the oscillation circuit is input to a divider such that a timer clock signal is generated.

The invention discloses a bionic double-shaft hair sensor device comprising a three-layer structure including metal aluminum alloy hair at an upper layer, a silicon microsensor at a middle layer and a glass substrate provided with a signal wire at a lower layer, wherein the metal aluminum alloy hair is adhered to a center position of the upper surface of the silicon microsensor; the microsensor is composed of a pedestal mass block, four swing suppression elastic structures and four resonator structures; the four resonator sub-structures are positioned in hollow areas on four sides of the pedestal mass block; and the four swing suppression elastic structures are positioned in hollow areas on the side surfaces of the four resonators. According to the device provided by the invention, variations of inherent frequency of fixed tuning fork resonant beams at two ends are detected, the sizes of axial forces suffered by the resonant beams are computed, so that sensitivity to flow speeds and accelerations in two directions in a plane is achieved, and the device has the advantages of small volume, light weight, compact structure and high resolution ratio and precision.

Tuning-fork type quartz-crystal vibrating pieces are disclosed, of which the vibration frequency can be adjusted without increasing CI. An exemplary piezoelectric device has a pair of vibrating arms extending in a predetermined direction from a first edge of a base. Respective first grooves are defined in a first principal surface of the vibrating arms. The first grooves extend in the predetermined direction, and have first excitation electrodes extending from a back-edge surface but not completely to a front-edge surface of the grooves. Respective second grooves are defined in a second principal surface, opposite the first principal surface, of the vibrating arms. The second grooves extend in the predetermined direction, and have second excitation electrodes extending from a back-edge surface completely to a front-edge surface of the second grooves.

The invention discloses a sidewalk guardrail with dust removing function, comprising two transverse bars and a hollow vertical bar arranged between the two transverse bars. A dust net is fixedly connected between the two transverse bars on one side close to a lane, and the side close to the lane and the sidewalk of the hollow vertical bar is provided with vertically arranged strip openings. A tuning fork, a chemical fiber material and a glass cylinder are arranged in the invention, the raised dust can be electrostatically adsorbed on the glass cylinder after the automobile passes through, andthe harm of the dust to pedestrians on both sides of the road is reduced; The dust on the glass cylinder can be cleaned by setting the scraper ring and the plate, so that the maintenance of the equipment is not needed, and the labor cost is reduced; A magnetic blade is arrange so that that magnetic blade intermittently attracts the dust screen when rotate, and the dust screen vibrates, and dust adsorbed on the dust screen can be shaken off by the vibration of the dust screen.

An electric junction box that can accommodate various circuit patterns in accordance with a combination of a printed-circuit board and a case housing the printed-circuit board. Connection pins connected to conductors are provided in a projecting position at intervals along the peripheral edge of a printed-circuit board. An opening corresponding to the printed-circuit board is formed in a central region of the upper side of a case. Connector joints are positioned on the peripheral walls of the four sides of the case, and L-shaped terminals are provided at the same intervals as for the connection pins along the opening. Additionally, a connection structure of a tuning-fork terminal includes a tuning-fork terminal at the end portion of a conducting plate base bent vertically and having a press connection slot in the center of the vertical portion; and a tab-shaped mating terminal electrically connected to contact portions projecting from inner sides of the slot.

Piezoelectric devices are disclosed that include a chip plate sandwiched between a lid plate and a base plate. The chip plate includes a tuning-fork type piezoelectric vibrating piece surrounded by an outer frame. The lid plate includes a concavity on its inner major surface, and the base plate includes a concavity on its inner major surface. The lid plate, chip plate, and base plate are bonded together to form a package containing the piezoelectric vibrating piece. The tuning-fork type piezoelectric vibrating piece includes a base having an X-direction width and at least pair of vibrating arms extending from the base in a Y-direction. The tuning-fork type piezoelectric vibrating piece is coupled to the outer frame by supporting arms extending in the Y-direction outboard of the vibrating arms. The concavity of the lid plate includes at least one base-movement “buffer” extending in the X-direction at a location corresponding to the base of the vibrating piece. The concavity of the base plate includes at least one base-movement buffer extending in the X-direction at a location corresponding to the base.

The disclosed apparatus can be adapted to work in most fishing lures. The apparatus allows the manufacture to adjust the sound(s) emitted by said fishing lure over a wide range, from several thousand hertz down to tens of hertz or lower. The hertz produced by one embodiment of the apparatus can be lowered to the point that the targeted game fish can interpret the action induced into the fishing lure by the disclosed invention more as movement of the fishing lure rather than sound emitted from the fishing lure. The apparatus obtains the energy it requires to operate from the movement of the fishing lure. One embodiment of the disclosed invention comprises a generic shell (top water fishing lure shell), a tuning fork and a pendulum. The stem of tuning fork is mounted to the inside wall of the shell, the pendulum is rotatably mounted to the interior wall of the shell in such a manner as to allow the weighted end of the pendulum to strike the tuning fork while the fishing lure is in use.

The invention discloses a resonant tuning fork liquid density sensor with piezoelectric actuation and piezoelectric detection, comprising a tuning fork body, a clamped body, a piezoelectric actuator, a piezoelectric vibration pickup, and a temperature sensor, wherein, the piezoelectric actuator and the piezoelectric vibration pickup are arranged on the clamped body, the generated alternating force is transmitted to the tuning fork body by the piezoelectric actuator to let the tuning fork body produce simple harmonic vibration with intrinsic frequency itself; when immersing the tuning fork body in a liquid under test, the additional mass of the tuning fork body changes so as to let the vibration frequency of the tuning fork body change; by picking up the vibration signal with the piezoelectric vibration pickup, the detection of the vibration frequency of the tuning fork body is realized; because the vibration frequency of the tuning fork body is a monotone function of the liquid density, thus the real-time on-line detection of the liquid density is realized; and the temperature sensor is arranged on the clamped body for real-time detection of the temperature of the liquid under test, and is used for compensating the variation of the elastic modulus of the tuning fork body. According to the invention, the high precision on-line detection of densities of various liquids at different temperature can be realized.

The invention discloses a three-axis micro-gyroscope based on a tuning fork driving effect, which comprise an upper-layer gyroscope structure and a lower-layer glass substrate, the upper-layer gyroscope structure comprises a left mechanical structure, a right mechanical structure, a middle mechanical structure, an upper crossbeam, a lower crossbeam, short beams, and anchor points, a turning mechanism based on tuning fork driving is designed in the middle mechanical structure, X-axis simple harmonic driving and Y-axis simple harmonic driving of sensitive weights of the middle mechanical structure are realized by the X-axis unidirectional driving of the left mechanical structure and the right mechanical structure, and thereby the consistency of driving frequencies between different axes is ensured. When angular velocity is inputted from outside, the sensitive weights receives Coriolis force to shift. By adopting a double-sensitive weight design and variable-interval capacitance differential detection, the three-axis micro-gyroscope can inhibit the common-mode interference of temperature, structural stress, acceleration and the like; the structure of the three-axis micro-gyroscope issymmetrically arranged, the stability is good, and the anti-interference capability is high.